Question

我是Android的初学者，我正在尝试编写一个简单的应用程序。当进入片段时，单击按钮启动其他片段，为此目的：

@Override
public void onClick(View v) {
    new Handler(Looper.getMainLooper()).post(new Runnable() {
        @Override
        public void run() {
            Toast.makeText(getActivity(), "Hello", Toast.LENGTH_SHORT).show();
            FragmentTransaction transaction = getActivity().getSupportFragmentManager().beginTransaction();
            secondFragment.removeAllViews();
            transaction.replace(R.id.secondFragment, new DashBoardFragment());
            transaction.commit();
        }
    });
}

但是在其他片段开始后显示Hello Toast，但我想在片段开始之前显示。

Answer 1

在onClick之后的toasting中尝试此操作： -

new Handler().postDelayed(new Runnable() {
    @Override
    public void run() {
        FragmentTransaction transaction = getActivity().getSupportFragmentManager().beginTransaction();
        secondFragment.removeAllViews();
        transaction.replace(R.id.secondFragment, new DashBoardFragment());
        transaction.commit();
    }
}, Toast.LENGTH_SHORT);

您的片段交易将在1500毫秒后发生（因此您的干杯信息会在交易发生前拍摄）

完整的点击方法......

@Override
public void onClick(View v) {
    Toast.makeText(getActivity(), "Hello", Toast.LENGTH_SHORT).show();
    new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
            FragmentTransaction transaction = getActivity().getSupportFragmentManager().beginTransaction();
            secondFragment.removeAllViews();
            transaction.replace(R.id.secondFragment, new DashBoardFragment());
            transaction.commit();    
        }  
    }, Toast.LENGTH_SHORT);              
}

在片段开始之前显示吐司

1 个答案: